German police once took DNA samples in a jewel heist. The samples led to two twins, Hassan and Abbas O. (German law prohibits naming them in full). Both of them denied committing the crime in spite of the fact that the German police knew one of them had done it (because of the DNA evidence). Unfortunately, they could not determine which one (because their DNA is basically the same since they are twins), and German law doesn't allow suspects to be held indefinitely. For this reason the police had no choice but to let them go.

The Hornsleth Deep Storage Project dropped a time capsule in the deepest part of the ocean in 2013. It contained human blood, hair samples, and animal DNA. This could all be used to bring endangered species back to life in the future.

John Schneeberger, a Zambian doctor living in Canada was charged with sexual assault. He implanted a tube of someone else's blood in his arm so that when it was drawn for DNA evidence he passed the test. He was eventually found out and deported.

Scientists encoded the song It's A Small World After All into the DNA of a bacteria that is resistant to radioactivity so that in the case of a nuclear holocaust, future humans or other life forms would find it.

Instead of venom, Braconid wasps inject their victims with a virus that suppresses the victim's immune system and allows the wasp's parasitic larvae to grow within the victim. Scientists found that this virus is unlike any other virus on Earth. It is over 100 million years old and apparently assimilated itself into the very DNA of the wasp.

Although there are numerous websites and services offering to do genetic tests on your saliva that will prove your ancestry, scientists have warned that this is little more than genetic astrology and should not be taken seriously.